Adjustment Procedures; Cassette Deck - Grundig RR 720 CD Serviceanleitung

RR 720 CD / RR 760 CD

Adjustment Procedures

1. Cassette Deck

Measuring instruments/equipment: Frequency counter, AF-voltmeter, wow and flutter meter, e.g. Fe test cassette 449.
Adjustment
1. Tape speed Connect the frequency counter to the headphone socket.
Insert e.g. test cassette 449, play 3150Hz.
2. Wow and flutter Connect the wow and flutter meter to the headphone
socket. Insert e.g. test cassette 449, play 3150Hz.
3. Head gap angle Connect the AF-voltmeter to the headphone socket.
(Azimuth) Insert e.g. test cassette 449,
play 8kHz.
4. Bias frequency Connect the frequency counter to connector CN403A
Pin 2 / Pin 4 (GND).
Insert a recordable cassette.
Function: Record-Start.
Amplifier Board
2. DC/DC Converter
Measuring instruments/equipment: Frequency counter
Adjustment
1. Converter Frequency counter to testpoint
frequency
TP
CPU Board
GRUNDIG Service
Preparations
Preparations
.
TP
Abgleichvorschriften / Adjustment Procedures
Adjustment Process
With adjustment control (in the cass.-motor) set the
±
frequency to 3150Hz 0.1%.
Bandgeschw.
Tape speed
≤
Deviation 0.35% (aurally compensated). Playback
measuring time ≥ 30 seconds.
With the head adjustment screw 1 set the
left and right channel to maximum level.
The levels of the two channels must not
differ by more than 3dB.
±
Set the frequency to 63kHz 0.5kHz with L401.
H D
PIN 2
G C
PIN 4
F B
E A
Adjustment Process
±
Set the frequency to 2.7MHz
1
0.1MHz with L103.
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